duration

Gem to calculate and update model attributes that represent lengths of time. based on test app at [git@github.com:xhostcom/calculate_duration.git]

Installation

Add lines to your application's Gemfile:

source 'https://gem.fury.io/xhostcom/' do gem 'duration', '~> 0.0.1' end

Or

gem 'duration', '~> 0.0.1', :github => 'xhostcom/duration'

And then execute:

$ bundle

Models/Concerns

make a model concern 'calculates_duration.rb' with the following

module CalculatesDuration extend ActiveSupport::Concern

included do after_save_commit :update_parent_duration

cattr_accessor :parent_to_update, :duration_association, :duration_column

end

class_methods do def calculates_duration_from(association_name, column: :duration) self.duration_association = association_name self.duration_column = column end

def updates_duration_of(parent_association)
  self.parent_to_update = parent_association
end

end

def update_duration! update(duration: calculate_duration) end

def calculate_duration send(self.class.duration_association).sum(self.class.duration_column) end

def update_parent_duration send(parent_association_name).update_duration! if has_parent_record? end

def parent_association_name self.class.parent_to_update end

def has_parent_record? !!send(parent_association_name) if parent_association_name end end

And in models use

include CalculatesDuration

serialize :duration, Duration

calculates_duration_of :model_name_plural

Contributing

Contribution directions go here.

License

The gem is available as open source under the terms of the MIT License.

Gemfile

source 'https://gem.fury.io/xhostcom/' do gem 'duration', '~> 0.0.1' end

gem "duration"

bundle install

Local install (download dir)

gem list duration gem install duration

Console

$ irb -r duration

Test

Full test app w/o gem

[git@github.com:xhostcom/calculate_duration.git]

apaciuk/duration